As an author i would like to say a few words. For almost every project i make there are some sharing tools required. There are many alternatives available, but none of them seemed decent enough for me and everyone had some flaws. There are also some online services that offer similar features using their remote JS, but for many projects i am not ok with dependency on another service. Therefore i created a library of sharing tools, that you could host by yourself and reuse in every project and stay focused on project development and not looking for best retina social buttons or dealing with share popups and so on.
As for new features - there are already some on their way, like share count for buttons, mobile version for floating bar, etc. See github issues with "Feature" label to see what's coming up next: https://github.com/darklow/socia...
Hope you find it useful!